Java Arrays

Last Updated : Mar 22, 2024

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Question 1

class Test {
   public static void main(String args[]) {
     int arr[2];  
     System.out.println(arr[0]);
     System.out.println(arr[1]);
   }
}

A
```
0
0
```
B
```
garbage value
garbage value
```
C
Compiler Error
D
Exception

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Question 2

Output of following Java program?

Java

import java.util.Arrays;
class Test
{
    public static void main (String[] args) 
    {
        int arr1[] = {1, 2, 3};
        int arr2[] = {1, 2, 3};
        if (Arrays.equals(arr1, arr2))
            System.out.println("Same");
        else
            System.out.println("Not same");
    }
}

A
Same
B
Not Same

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Question 3

Output of following Java program?

class Test
{
    public static void main (String[] args) 
    {
        int arr1[] = {1, 2, 3};
        int arr2[] = {1, 2, 3};
        if (arr1 == arr2) 
            System.out.println("Same");
        else
            System.out.println("Not same");
    }
}

A
Same
B
Not Same

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Question 4

Java

class Test {
   public static void main(String args[]) {
     int arr[] = new int[2];  
     System.out.println(arr[0]);
     System.out.println(arr[1]);
   }
}

A
```
0
0
```
B
```
garbage value
garbage value
```
C
Compiler Error
D
Exception

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Question 5

Java

class Test
{
    public static void main (String[] args) 
    {
        int arr1[] = {1, 2, 3};
        int arr2[] = {1, 2, 3};
        if (arr1.equals(arr2))
            System.out.println("Same");
        else
            System.out.println("Not same");
    }
}

A
Same
B
Not same

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Question 6

Predict the output?

Java

// file name: Main.java
public class Main {
    public static void main(String args[]) {
       int arr[] = {10, 20, 30, 40, 50};
       for(int i=0; i < arr.length; i++)
       {
             System.out.print(" " + arr[i]);              
       }
    }
}

A
10 20 30 40 50
B
Compiler Error
C
10 20 30 40

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Question 7

Which of the following is FALSE about arrays in Java?

A
A java array is always an object
B
Length of array can be changed after creation of array
C
Arrays in Java are always allocated on heap

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Question 8

public class Main {
    public static void main(String args[]) {
        int arr[][] = new int[4][];
        arr[0] = new int[1];
        arr[1] = new int[2];
        arr[2] = new int[3];
        arr[3] = new int[4];
 
        int i, j, k = 0;
        for (i = 0; i < 4; i++) {
            for (j = 0; j < i + 1; j++) {
                arr[i][j] = k;
                k++;
            }
        }
        for (i = 0; i < 4; i++) {
            for (j = 0; j < i + 1; j++) {
                System.out.print(" " + arr[i][j]);
                k++;
            }
            System.out.println();
        }
    }
}

A
Compiler Error
B
```
 0
 1 2
 3 4 5
 6 7 8 9 
```
C
```
 0
 0 0
 0 0 0
 0 0 0 0 
```
D
```
 9
 7 8
 4 5 6
 0 1 2 3 
```

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